Jet-photometer.



L. E. KNOTT.

JET PHOTOMETEE.

nrmonron FILED JULY 15, 1907.

Patented Dec. 15, 1908.

UNITED STATES PATENT OFFICE.

LOUIE E. KNOTT, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO L. E. KNOTT APPARATUS COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

J'ET-PHO'IOME-TER.

Specification of Letters iatent.

Application filed. July 15, 1907. Serial No. 383,196.-

To allwhom it may concern.

Be itknown that 1, LoUrE 'E. K'No'r'r, a citizen of the United'States, residing at Boston, county of Suffolk, and State of Massachusetts, have invented an Improvement in J et-Photometers, .of which the following description, inconnection with the accompanying drawing, is a specification, like letters on the drawing representinglike parts.

This invention relates to jet photometers such-asare used for indicating the candle power of gas. 1

The object of the invention is to provide'an improved device of this class which is so constructed that it can be easily and accurately adjusted a very short time, and which can be used in measuring or indicating the candle power of different kinds of gas.

Jet photometers as now commonly constructed are rather diflicult to adjust, and in their manufacture a great deal of skill and care is required in bringing each individual device to a proper state so that it will correctly indicate candle power of gas. With my improvement, however, this adjustment is a comparatively simple matter and can be accomplished in a few seconds time.

I will first describe one embodiment of my invention and then point out the novel features thereof in the appended-claim.

In the drawings, Flgure 1 is a side view in elevation of a jet photometer involvin my invention, and Fig. 2 is a vertical centra section on an enlarged scale.

The device comprises a base piece 3 which is adapted to be screwed to a gas pipe 4and which has within it a chamber containing a float 5. This float is bell-shaped, and its lower edges rest in an annular sealing chamber 6 WlllOh is partially filled with glycerin or some other li uid thereby forming a liquid seal. Secured to the top of the base is a cap 7 having an aperture 8 therethrough whic leads to the jet burner 9 that is supported by the cap in any suitable. or usual wa The float is provided with a valve 10 w ich 00- operates with in Fig. 2; I

11 is a chimney su ported by the burner on which is indicated a scale 12 designating candle power.

A duct is formed around the float 5 through which duct the-gas is admitted to the burner 9 and. the accuracy of the instrument depends upon securing the proper size the aperture 8,, as plainly seen of duct. The float 5 and its. valve 10. act as a pressure regulator to maintain ,a constant pressure at the burner, and the size of the duct controls the amount of gas delivered.

The graduations on thescale 12 have such Patented Dec. 15, 1908.

a relation to the size of the burner and to the amount of gas delivered that the height of the flame as read on said scale indicatesthe correct candle power of the gas, and for this reason it will be evident that in order that the reading may be correct the size of the duct -must be very-accurately adjusted. To secure this accurate adjustment of the amount of gas. delivered through the duct.

and provide a construction by vmeans of which such accuracy may be obtained in a minimum time, Iprovide my device with a duct 13 which connects the chamber 15 that communicates with thegas pipe 4 with the chamber 16 above the float 5 and which duct is formed in the boss 14 formed on the base 3. The boss 14 is formed exterior to the base and at its upper end terminates in a horizontallyextending projection 30. The gas duct 13- terininates at its upper end in a discharge port 18 which is controlled by a needle-valve 19, said'needle-valve preferably being screwthreaded into the horizontally-arran ed portion of the boss 14 and provide with a notch 21 by means of which 1t may be turned by a suitable instrument. valve 19 makes a very simple and yet efi'ect ive way of adjusting the size of the duct." It is emential that the lower end of the duct 13 enter the chamber 15 at a point above the This needle-- end of the gas pipe when the base 3is screwthreaded thereon, and therefore I make said base with the screw-threaded nip le or extension 23 which is screw-threaded? on to the gas pipe and so arrange the duct 13 that it enters the chamber 15 above the screwthreaded portion of the nipple 23.

After the device has been made and assembled, as shown, it is essential that it be adjusted before it can be used to re ister the candle power of gas, andin thus ad usting or .settin 1t, it is screwed on to a gas pipe along side 0% a standardized instrument, and after bein lighted the needle-valve 19 is adjusted usted (and the correct adjustment thereof the device has not been tampered with after and the size of the duct 13 has to be differimproved device, therefore, is one which can it has been sealed. t

For, measuring candle power of different kinds of gas difierent chimneys must be used,

ently adjusted. With my improvement the same instrument can be readily converted into one adapted to measure candle power of different kinds of gas by simply shifting the needle-valve 19 as will be obvious. My

be readily and accurately adjusted and which can be used for determining the candle power of different kinds of gas.

I have illustrated herem one embodiment only of my invention.

Having fully described my invention, what I I claim as new and desire to secure by Letters Patent is:

In a jet photometer, the combination with a burner, of a base having a gas inlet terminating in a chamber having an 0 en top and surrounded by an annular liqui containing chamber and a gas outlet communicating with said burner, a bell-shaped float inclosing the top of said chamber and having its ed es contained in said annular chamber, a va ve carried by said float for controlling the gas outlet, said base having exterior thereto a vertically extending rib 14 in which is formed a gas duct 13, the discharge end of which is arran ed horizontally and is provided with a va ve seat, and a valve for said seat screw-threaded in the said rib and situated entirely therewithin. Y

In testimony whereof, I have signedtmy name to this specificatiomin the presence of two subscribing Witnesses.

LOUIE E. KNOTT.

Witnesses:

THOMAS J. DRUMMOND, LoUIs O. SMITH. 

